Curling iron



FIG. 1 is a right side elevational view of a curling iron showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front end elevational view shown on an enlarged scale;

FIG. 4 is a rear end elevational view thereof;

FIG. 5 is a top plan view of FIGS. 1 and 2; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a curling iron, as shown and described. 